High risk human papillomavirus (HR-HPV) are recognized as a necessary factor to development cervical cancer. During the last decade many studies have found HR-HPV in oral squamous cell carcinoma (OSCC) and normal oral mucosa, however the association between HR-HPV and OSCC is still uncertain. The aim of the study was to determine DNA HR-HPV in normal oral cavity of healthy adults. A cross-sectional study was performed; samples from 77 patients with normal oral cavity were collected at the Dentistry school, Autonomous University of Yucatan, Merida, Yucatan, México. HR-HPV was detected by hybrid capture 2. One sample out of 77(1.2%) was positive for HR-PVH. It was from a man of 50 years old. HRHPV is present in low rate among healthy oral mucosa. Hybrid capture 2 could be a good methodology for large epidemiology studies.

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To the editor: Respiratory infections (RI) and acute diarrhoea (AD) are the main causes of morbidity and mortality among Mexican children. A retrospective analysis of rotavirus (RV) epidemics in Merida, Mexico from 2003 to 2008 indicates that 31.5% of children with diarrhoea also present respiratory symptoms. We hypothesized that the co-occurrence (mixed clinical symptoms) of RI and AD may also be a result of mixed diarrheal and respiratory viral infections in children. To address this possibility we evaluated the presence of different respiratory viruses in children diagnosed with acute diarrhoea in two slums with poor housing and health conditions in Merida. This prospective study involved a total of 127 children under 5 years of age with AD who received medical attention at the "Units of Social Insertion" (USIs) from July 2003 to June 2004. The selected USIs are health units serving people in the city who do not have social security. Faecal samples were collected to detect RV infection and a throat swab was collected from all children to detect influenza and/or other respiratory viruses. Clinical and epidemiological data were collected from all patients. Faecal samples were processed for rotavirus (RV) using polyacrylamide gel electrophoresis (PAGE). 1